languagetool-org/languagetool ? reverse-engineered prompt

Build me an open source proofreading tool that checks grammar, spelling, and style in English and a bunch of other languages, with a local server I can run on my computer and a simple way to test text from the command line. I’d like it to feel like a real LanguageTool style app, so it should catch more than just misspellings, give clear suggestions, and work well with long pasted text.

Please set it up so I can build it from source, start the server, and run a basic desktop or standalone version too if that’s already part of the project. Make sure the main pieces work together, the project builds cleanly, and there’s an easy example of how to send text to the checker and read back the issues. If anything depends on current docs or setup details, look them up online if needed and keep the instructions simple.